Poster D99, Monday, March 26, 8:00-10:00 am, Exhibit Hall C
Spontaneous in-flight accommodation of hand orientation to unseen grasp targets: A case of action blindsight
Emily K. Prentiss1, Colleen L. Schneider1,2, Zoë R. Williams3, Bogachan Sahin3, Bradford Z. Mahon1,3; 1University of Rochester, 2University of Rochester School of Medicine and Dentistry, 3University of Rochester Medical Center
The division of labor between the dorsal and ventral visual pathways is well established. The ventral stream supports object identification, while the dorsal stream supports online processing of visual information in the service of visually guided actions. Here, we report a case of an individual with a right inferior quadrantanopia who exhibited accurate automatic rotation of his wrist when grasping a target object in his blind visual field. His accurate wrist orientation was observed despite the fact that he exhibited no sensitivity to the orientation of the handle in a perceptual matching task. These findings indicate that non-geniculostriate pathways process basic volumetric information relevant to grasping, and reinforce the observation that phenomenal awareness is not necessary for volumetric properties of objects to influence visuomotor performance.
Topic Area: PERCEPTION & ACTION: Vision